TL604 / SN99661 Replacement (TL604JDP)

Do you have an amplifier with a failed TL604 or SN99661? As I’m sure you have discovered, this IC is no longer made. These ICs appeared in many late 70s and 80s Peaveys as well as in some Gallien-Krueger. At one time, Peavey offered an adaptor kit to utilize a more modern part as a replacement. However, it appears that kit is too discontinued. JDP Amplifiers now offers a solution, a drop in replacement using a modern part and a custom made adaptor board!

This adapter board is truly tiny! It’s only slightly larger than the original IC. It offers the same characteristics as the original TL604 part but using parts that are still being produced today. I have it pictured mounted in a Peavey Classic VT-212 as well as the adapter ready to be mounted in a Gallien-Krueger 250ml.

The best part of this adapter is there is no assembly necessary. Once you receive it, it’s literally plug and play. The logo marks the top of the part and is nearest pins 1 and 8. Simply remove the old part (or desolder it) and install the new one. It could not be any easier!

I included a full datasheet for this adaptor as pictures. It can be downloaded in .pdf format from my website as well. The datasheet uses the worst case across all 4 ICs.

NOTE: This adaptor is designed to use 1 of 4 different modern ICs to avoid future obsolescence and supply chain issues. You may receive any one of the 4 versions pictured. They are all functionally equivalent. 2 versions have the new IC mounted on the bottom side of the adaptor and will appear empty from the top side.

For Customers In Australia:
Contact Open Ear Audio for an authorized local distributor and save on shipping costs!